The formation of Mg ferrite by mechanical alloying and sintering

Moustafa, S.F.; Morsi, M. B.

doi:10.1016/s0167-577x(97)00177-8

Cited by 34 publications

(5 citation statements)

References 13 publications

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“…The thermal decomposition occurs in three major consecutive steps: 2. Ferrites with an average particle size of 50-55 nm have been obtained at much lower temperature than possible by the conventional ceramic method [16,17]. This is due to the direct decomposition of the ferricitrates into oxide/carbonate phase (without undergoing reduction to iron (II) state) and subsequent atomic scale mixing of cations to yield ferrites as the final products.…”

Section: Discussionmentioning

confidence: 99%

Application of Mössbauer spectroscopy to the thermal decomposition of strontium and barium bis(CITRATO)Ferrates(III)

Randhawa

Kaur

2008

Hyperfine Interact

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The thermal decomposition of M 3 [Fe(cit) 2 ] 2 4H 2 O (M = Sr, Ba) has been studied isothermally and non-isothermally employing simultaneous (TG-DTG-DSC), XRD, IR, SEM and Mössbauer spectroscopic techniques. The anhydrous complexes decompose at 140-220 • C to yield α-Fe 2 O 3 and MC 5 H 4 O 5 (metal acetonedicarboxylate) intermediates. The latter decomposes to respective carbonate at higher temperature. α-Fe 2 O 3 and MCO 3 undergo a solid state reaction in the temperature range 400-430 • C to yield Sr 2 Fe 2 O 5 and BaFe 2 O 4 respectively. Finally above 600 • C, a solid state reaction between these products and respective metal oxides leads to the formation of M 3 Fe 2 O 7−X showing simultaneous presence of Fe(III) and Fe(IV) species. These perovskite ferrites can exhibit electrical conductivity and dielectric properties. SEM analysis shows these ferrites to be nanosized with average particle diameter of 50-55 nm.

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Section: Discussionmentioning

confidence: 99%

Application of Mössbauer spectroscopy to the thermal decomposition of strontium and barium bis(CITRATO)Ferrates(III)

Randhawa

Kaur

2008

Hyperfine Interact

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“…Earlier results on the Table 1 The particles size range according to the TEM observation. copper (CuFe 2 O 4 ), magnesium (MgFe 2 O 4 ) and zinc (ZnFe 2 O 4 ) stoichiometric ferrites have shown that only zinc ferrite is not magnetic at room temperature [21][22][23]. Besides, the former is an inverse spinel (B hf $ 480 kOe/site A-512 kOe/site B), the middle one is a partially inverse spinel (degree of inversion $0.9; B hf $ 482 kOe/site A-500 kOe/site B) whereas the later is a normal spinel.…”

Section: Structural Properties Of Nanoparticlesmentioning

confidence: 99%

The role of copper ions on the structural and magnetic characteristics of MgZn ferrite nanoparticles and thin films

Ghasemi

Ashrafizadeh

Paesano

et al. 2010

Journal of Magnetism and Magnetic Materials

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“…In contrast to ZnFe 2 O 4 , the analogous magnesium analogue MgFe 2 O 4 adopts an inverted spinel structure with almost all trivalent cations in the tetrahedral sites. However, when mechanochemically activated, or when obtained by high-speed ball milling, MgFe 2 O 4 exhibits an almost completely statistical (67%) distribution of trivalent cations in the tetrahedral sites [ 144 ]. Nickel(II) ferrite, NiFe 2 O 4 , is a related ferrite material whose mechanochemical synthesis was first attempted by mechanochemical route by Lefelstehl and co-workers but without success.…”

Section: Acid–base Reactions: Synthesis Of Mixed Metal Oxidesmentioning

confidence: 99%

Shaking Things from the Ground-Up: A Systematic Overview of the Mechanochemistry of Hard and High-Melting Inorganic Materials

Auvray

Friščić

2023

Molecules

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We provide a systematic overview of the mechanochemical reactions of inorganic solids, notably simple binary compounds, such as oxides, nitrides, carbides, sulphides, phosphides, hydrides, borides, borane derivatives, and related systems. Whereas the solid state has been traditionally considered to be of little synthetic value by the broader community of synthetic chemists, the solid-state community, and in particular researchers focusing on the reactions of inorganic materials, have thrived in building a rich and dynamic research field based on mechanically-driven transformations of inorganic substances typically seen as inert and high-melting. This review provides an insight into the chemical richness of such mechanochemical reactions and, at the same time, offers their tentative categorisation based on transformation type, resulting in seven distinct groupings: (i) the formation of adducts, (ii) the reactions of dehydration; (iii) oxidation–reduction (redox) reactions; (iv) metathesis (or exchange) reactions; (v) doping and structural rearrangements, including reactions involving the reaction vessel (the milling jar); (vi) acid–base reactions, and (vii) other, mixed type reactions. At the same time, we offer a parallel description of inorganic mechanochemical reactions depending on the reaction conditions, as those that: (i) take place under mild conditions (e.g., manual grinding using a mortar and a pestle); (ii) proceed gradually under mechanical milling; (iii) are self-sustained and initiated by mechanical milling, i.e., mechanically induced self-propagating reactions (MSRs); and (iv) proceed only via harsh grinding and are a result of chemical reactivity under strongly non-equilibrium conditions. By elaborating on typical examples and general principles in the mechanochemistry of hard and high-melting substances, this review provides a suitable complement to the existing literature, focusing on the properties and mechanochemical reactions of inorganic solids, such as nanomaterials and catalysts.

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The formation of Mg ferrite by mechanical alloying and sintering

Cited by 34 publications

References 13 publications

Application of Mössbauer spectroscopy to the thermal decomposition of strontium and barium bis(CITRATO)Ferrates(III)

Application of Mössbauer spectroscopy to the thermal decomposition of strontium and barium bis(CITRATO)Ferrates(III)

The role of copper ions on the structural and magnetic characteristics of MgZn ferrite nanoparticles and thin films

Shaking Things from the Ground-Up: A Systematic Overview of the Mechanochemistry of Hard and High-Melting Inorganic Materials

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